Hydrostatic press



, l HMay 21,1929. o. PABsT ETAL n 1,714,043

H'YbRosTATIc PRESS Filed Feb. 1'7, 1926 struction and operation set forth inthe fol:-`

Patented yMay "2l,l 1929,

..UNITEDjsTATES` OTTO r'ABsT 'AND1 CABLTQSETBERT; or

y BEMENT-POND JERSEY.

PATENTLOFHCE4- HAMILTON; OHIO,Y AssIeNons To 'N'IIiEs-i COMPANY, or NEW Yoan, N. lLLA` CORPORATION lor NEW `EYDROSI'ATIIG PRESS i ApplicationfiledV Februar`y'17, 1925:. lSerial No.`88,9'63.

. VThis invention-relates tohydros'tatic presses' and in particular to a press of this typeadapt-` ed. for pressing car `and locomotive wheelsv upon their* axles. v

An objectv of vthe present provide improved fluid operatedrmeans for quickly returning the ram toits retracted position after it has been forced forwardly .during its operative stroke, to yre-postion it fory cylinder-by means of the operation of the con-1 trolling valve for admitting flu-id to the main.

plunger or ram cylinder.

Another feature of importanceis that fluidfor returning lthe ram is supplied vfrom a .press .sure tank containing fluid for rapidly #advancling the ram during the initial portions of itsVK forward stroke, -a four-way vvalve beingus'ed to control the admission of fluidk to the main and auxiliary cylinders.`

'Withthese and other objects-in view',` our 7^ Y invention consists in the feature of the concoinpanying drawing. In the accompanying lowing specification and illustrated the acA tion, we have shown' our inventionv embodied in a `hydrostaticy press of the horizontal type4 adapted primarilyI forvpressing railroad car-y riagc and locomotive' wheels' ontheirfaxles,

but it is'fto bei understood that'manypof the objects of the invention can'be Otherwlse em.

bodied and that the drawing is not to be conf.

strued as defining-or'liiniting-the scope ofthe invention, theclaim appended to this speci.-

Vfication being relied upon for that purpose. l

rIn the annexed drawing :f .f n y y Figure l showsaside elevation of one end of a hydrostatic press having the', present in'- vention appliedxther'et/o.`

main controlling valve, and p Fig. 3 is a ysection' through a four-way. valve. In Vthe Vabove mentioned drawing we have shown but one lembodiment of the invention invention is toV j. u piece (not shown) in fixed position relative to" drawing annexedj hereto and forming a part: of this'speci'fica;y

which is now deemed preferable, but it is to bek e, understood that 4 changes, and modifications ymay be made Within the scope of the appended clalm without departing from the spirit of the f invention. f

Briefly, and in lts broadest aspect, ouriny ventlon comprises the following', principal parts: First, a body member or headst-Ock. y

formed with a cylinder of large diameter; L` Y l second, a ram movable in and out of suchy cylinder ;third, a pump for forcing a fluid under v extremely high pressure to said cylinder;-`v fourth, a tank comprising fluidsubjected to pressure and adapted to be admitted tosaid main cylinder to-jrapidly' advance the ram an auxiliary lcylinder Vattached to the main body .memberand 'having a p'iston'therein; sixth, means for' connecting this piston, pref- -erably through flexible means,to the ram; seventh, means for admitting fiuidto one end of this auxiliary cylinder; eighth,a"main L valve for vcontrolling the admission of fluid' the drawing,we show; the headstock end 10 of a standardform of horizontal hydrostatic z press having afcylinder ll formed centrallyl thereof and provided with.V upper and lower during portions ofits lforward stroke.; fifth,

tie' rods l2 and' 13 4adaptedto .retain a4 tailthe body. member or headstoc'klO. `Within under extremely high pressure may beforced f into the rearfof the cylinder ll'.

l 9c the cylinder l1l isa rainer piston lahaving its?` Y forwardend y suitably .formedV to engagea To `quickly Iadvance the ram la when'itV is p i not subjectedjto high resistance by\ the f'piece f being forced into or out of position, an aux? i iliary supply of fluid is provid'e'din a suitable "tank 18 positioned adjacentgthe body mem- Fig. .2 shows a sectional viewfthrough the vsuch as that described are used. Forthis purc being seenin Fig. 1. This cylinder 35 may'V pose a valve 19 is'provided inthe fluid supply conduit 20 permitting the fluid, such las air, to be admitted to the tank 18 Vthrough conduit 21. Movement of the valve 19 to another operative position permits the presby the compressed air Within tank 18 passe s`V on its way to the cylinder 11. Within this` conduit 26 is a check valve 27 preventing fluid from thel main cylinder 11 passing back to the tank 18 during operation of the pump 15. i Y

Cylinder 11, when the ram 14 has completed its operative or forward stroke, is adapt ed to be exhausted of its fluid by means of the main controlling valve 30, and the fluid discharged therefrom is adapted to flow into an open tank 31 through conduit 32 from Vwhich it may drain into the` auxiliary pressure tank 18 through conduit 33. lor that purpose the fluid pressure above this waterV or other fluid within the tank 18 is released by means of valve 19. Y

The above describel form of hydrostatic press is one substantially as vnow `made and has for some years been a standard method of manufacture of such machines. Y 14, when it has completed its forward n1ovement, has, inthe past, beenreturned to its inner or retracted position by means of heavy counterweights passing over idler pulleys and attached to a portion of the ram 14. This undulyincreases the weight of the 1`na-` chine an d also requires considerable power to raise the counterweights during theforward or operative movement `of `the ram. Also,

unless the weights are `unduly heavy, the

movement ofthe rain to its retracted position` is extremely slow. To avoid the inconveniences and loss of'time occasionedvby these heavy counterweights, an auxiliary cylinder 35 is mounted adjacent the body member 10 and fastened thereto in any suitable manner, as by means of bolts andtie rods 36, one only also besupported by meansof a-rod '36a suitu 35 which extends in a direction parallel to the ram 14, is a piston 37 having a piston rod 38 extending from one end attached by means Y rod 38 is supported by a small cross head 41 having a roller adapted to engage the. surface of the tie rods 36 so that the forward The ram` Vduit 32. Y

end Yof the piston rod 38 is maintained in line with .the axis of the auxiliary cylinder 35.

ln order to admit fluid to the forward end ofthis ycylinder 35 to move the piston 37 in a d irectionfto return the ram or plunger 14, there is provided a conduit 42 connected through four-way Valve 25 to the auxiliary pressure tank 18. It will be seen that when the four-way valve 25 is in one position, fluid may be admitted from the pressure tank 18 directly to the forward end `ofy this auxiliary cylinder 35 and, with the four-way valve in another position, the fluid may be exhausted from this auxiliary cylinder 35'into the open tank 31 through a special conduit 43 provided therefor. In order to actuate the four-way valve, shown in cross section in Fig. 3, to control the admission and discharge of fluid to and from `the auxiliary cylinder 35, the fourway valve 25 is attached by `means of a lever 44 and reach rod 45 to an oscillating member 46 adjacent the stem of the mainV controller valve 30 so that when the controller valve 30 is moved to a position to advance the ram 14, Y

the four-wayV valve 25 .will be positioned to permit fluid toexhaustfrom the auxiliary cylinder 35. When the ram V14 islto be returned and the pump 15is stopped so that no. fluid is yadmitted to the ram cylinder 1l, the main controller valve 30may be actuated to move tliefour-\vay valve 25 to a'position -to admit fluid to the forward end of the auxiliary cylinder 35 and'simultaneously open the valve30 to exhaust-fluid from the cylinder 11 into thel opentankSlthrough con- .On the forward end of the piston rod 38 is an abutment() preferablyadjustable and i adapted to strike `a lever 51`on the valve 19 adjacent its handle. As soon,therefore,`fas

` the ram is retracted to its initial position, the

abutment 50 will strike lever 51 and oscillate the valve 19. To complete. the movement of the valve 19 the coiled spring 23 isprovided.

`VViththe valve 19 in this `oscillated position the fluid within the opentank 31 can drain back into the pressure tank 18.

`Preferably the leverl land handle 52 'of` y. toadmit fluid again to th l' l 11. ablysupportedjupon the flooring' or base c e Cy me er plate of the machine.A Within Vthis cylinder` To oscillate the arm 46 to control the movement ofthe four-wayvalve 25, a'worm 47 is mounted on and fixed to the stem of the valve 30 engaging a segmental gear .48 keyed to a shaft 49. lArm 46 is also keyedto this shaft 49 so thatrotation ofthe hand wheel tol ac tuate the valve -30 alsorotates thel worm 47 and oscillates the arm 44 to move the valve 25. lVhat we claim is: Y

A hydrostaticV press comprising in combination, a body member, a cylinder thereon,

a ram movable therein, a pump adapted to force fluid into said cylinder to advance said ram, a source of fluid under pressure, means for utilizing said fluid under pressure to I force said first fluid into said cylinder independently of said pump, an 'auxiliary cylinder, a piston therein attached to said ram, means t0 admit fluid to said auxiliary cylinder to return said ram, a valve for controlling t-he admission of fluid to said first mentionedl 10 cylinder, and means attached `to said valve to control the admission of fluid to said supplemental cylinder.

In testimony whereof, We hereto afiix our signatures.

OTTO PABsT. CARL F. SEIBERT. 

